PC-MAR20-LANDIA.qxp_Layout 1 19/02/2020 10:25 Page 1 WATER & WASTE TREATMENT INDUSTRY FOCUS


savings are substantial. Reduced running times also means that pump-wear components last longer. Cambi’s THP exposes sewage


sludge at Nigg to high temperatures (160˚C to 180˚C) and pressures (about 6 bars), typically for 20 to 30 minutes for each batch to ensure pathogen kill. Sterilised and hydrolysed sludge is passed to the flash tank, which operates at atmospheric pressure. The sudden pressure-drop leads to substantial


cell destruction of the organic matter in the sludge, which is then cooled before it is fed to the digesters. Wrigglesworth concluded: “Post-


refurbishment, we’ve now had a decent period of stabilisation, with no major hiccups in the performance or reliability of the Cambi and Landia equipment. With a 25% to 30% increase in our gas production, we’re in such a better place.”


Landia Chopper Pump


– the original and still the best for


HARD TO HANDLE wastewater applications


The Cambi Thermal Hydrolysis Process (THP) at the Nigg facility Landia


Cambi


www.landia.co.uk www.cambi.com


TERTIARY TREATMENT MAINTAINS COMPLIANCE


Technology from onsite wastewater treatment specialist WPL has been selected by Anglian Water to deliver enhanced ammonia removal at a major works. Five WPL Hybrid-SAF (submerged aerated filter) units are providing a level


of tertiary treatment at Cliff Quay Water Recycling Centre, Ipswich, to maintain the Environment Agency standards for ammonia removal. Anglian Water had hired the modular units from WPL on a temporary basis in 2019, but has now taken the opportunity to purchase them. Installed downstream of the existing biological treatment plant, each unit


is able to treat approximately 10l/s flow when required. A proportion of the flows are pumped to the units, which connect to the site’s existing final settlement tanks. Each Hybrid-SAF unit achieves 10mg/l ammonia reduction, ensuring the


site maintains the Environment Agency’s ammonia effluent requirement of 50mg/l. The agency’s regulations state the site must meet these standards at least 95% of the time. WPL’s utility manager Andrew Haywood said: “By initially providing the


units on a hire basis, we were able to demonstrate their compatibility for this site, enabling the customer to maintain ammonia compliance in a relatively short space of time, whilst the longer-term capital solution is delivered. “WPL has a long history of supplying SAF units to Anglian Water, with a


framework agreement in place, and we were delighted to be part of this important project to maintain regulatory standards and offer greater protection to the environment.” WPL International


www.wplinternational.com / PROCESS&CONTROL tel. 01948 661 200 . landia.co.uk PROCESS & CONTROL | NOVEMBER 2020 29


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